package com.loading;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Handler;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
public class LoadingView extends View{
private Paint loadPaint;
private Paint paint;
private String text="今日头条";
private float percent;
private Handler handler=new Handler();
public LoadingView(Context context) {
this(context,null);
}
public LoadingView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs,0);
}
public LoadingView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initPaint();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
Rect bounds=new Rect();
paint.getTextBounds(text, 0, text.length(), bounds);
setMeasuredDimension(bounds.width(),bounds.height());
}
private void initPaint() {
paint=new Paint();
paint.setColor(Color.parseColor("#999999"));
paint.setTextSize(60);
loadPaint=new Paint();
loadPaint.setStyle(Paint.Style.FILL);
loadPaint.setColor(0x70ffffff);
}
@Override
protected void onDraw(Canvas canvas) {
drawText(canvas);
drawLine(canvas);
}
private void drawLine(Canvas canvas) {
if(null==canvas){
return;
}
canvas.save();
Rect bounds=new Rect();
paint.getTextBounds(text, 0, text.length(), bounds);
Rect rect=new Rect(0, 0, (int) (bounds.width()*percent), bounds.height());
canvas.clipRect(rect);
canvas.drawRect(rect,loadPaint);
canvas.restore();
handler.postDelayed(new Runnable() {
@Override
public void run() {
if(percent>=1.0){
percent=0;
}else{
percent+=0.05f;
}
postInvalidate();
}
},200);
}
private void drawText(Canvas canvas) {
if(null==canvas){
return;
}
Paint.FontMetricsInt fm=paint.getFontMetricsInt();
canvas.drawText(text, getWidth() / 2 - paint.measureText(text) / 2,
getHeight() / 2 - (fm.bottom + fm.top) / 2, paint);
}
@Override
protected void onWindowVisibilityChanged(int visibility) {
if(visibility==View.VISIBLE){
percent+=0.05f;
invalidate();
}
}
}
